This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Fundamentals and Basic Techniques of Residual Stress Measurements With a Portable X-Ray Diffraction Unit
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1967 by SAE International in United States
Annotation ability available
The X-ray diffraction method for nondestructively measuring residual stresses in metals is advantageous as it does not require a zero stress condition. With the use of a portable X-ray machine and the back reflection film technique, the method becomes even more useful for measuring stresses in components as the component size is no longer a limitation. This paper discusses the fundamentals, basic techniques, and the type of equipment commonly associated with the portable film technique.
Bragg's law and its application to residual stress measurements are presented. The single exposure approach for the portable film technique is contrasted with the double exposure method that is commonly employed with the direct-reading diffractometers. The necessity for determining the stress factor for each material and heat treatment is presented.
This technique was applied to measuring residual stresses in three 7079-T6 forgings. The purpose of the program was to determine a manufacturing process sequence that would minimize harmful residual stresses in the machined forgings.
CitationHomicz, R., "Fundamentals and Basic Techniques of Residual Stress Measurements With a Portable X-Ray Diffraction Unit," SAE Technical Paper 670151, 1967, https://doi.org/10.4271/670151.
- Barrett C. S., “Structure of Metals.” New York: McGraw-Hill Book Co., 1952.
- Cullity B. D., “Elements of X-ray Diffraction.” Reading, Mass.: Addison-Wesley Publishing Co., 1956.
- Christenson A. L. (ed.), “The Measurement of Stress by X-ray.” Prepared by the X-ray Subcommittee of Division 4 (Residual Stress and Fatigue) of the SAE Iron and Steel Technical Committee, HS-182.
- Bolstad D. et al., “Measuring Stress in Steel Parts by X-ray Diffraction.” Metal Progress, Vol. 84, July 1963, pp. 88-92ff.